Home | History | Annotate | Download | only in Framework
      1 //
      2 //  TreeVisitorAction.h
      3 //  ANTLR
      4 //
      5 //  Created by Alan Condit on 6/18/10.
      6 // [The "BSD licence"]
      7 // Copyright (c) 2010 Alan Condit
      8 // All rights reserved.
      9 //
     10 // Redistribution and use in source and binary forms, with or without
     11 // modification, are permitted provided that the following conditions
     12 // are met:
     13 // 1. Redistributions of source code must retain the above copyright
     14 //    notice, this list of conditions and the following disclaimer.
     15 // 2. Redistributions in binary form must reproduce the above copyright
     16 //    notice, this list of conditions and the following disclaimer in the
     17 //    documentation and/or other materials provided with the distribution.
     18 // 3. The name of the author may not be used to endorse or promote products
     19 //    derived from this software without specific prior written permission.
     20 //
     21 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26 // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31 
     32 #import <Foundation/Foundation.h>
     33 #import "BaseTree.h"
     34 
     35 @interface TreeVisitorAction : NSObject
     36 {
     37     SEL preAction;
     38     SEL postAction;
     39 
     40 }
     41 
     42 @property (assign, setter=setPreAction:) SEL preAction;
     43 @property (assign, setter=setPostAction:) SEL postAction;
     44 
     45 + (TreeVisitorAction *)newTreeVisitorAction;
     46 - (id) init;
     47 
     48 - (void)setPreAction:(SEL)anAction;
     49 - (void)setPostAction:(SEL)anAction;
     50 
     51 /** Execute an action before visiting children of t.  Return t or
     52  *  a rewritten t.  It is up to the visitor to decide what to do
     53  *  with the return value.  Children of returned value will be
     54  *  visited if using TreeVisitor.visit().
     55  */
     56 - (id<BaseTree>)pre:(id<BaseTree>) t;
     57 
     58 /** Execute an action after visiting children of t.  Return t or
     59  *  a rewritten t.  It is up to the visitor to decide what to do
     60  *  with the return value.
     61  */
     62 - (id<BaseTree>)post:(id<BaseTree>) t;
     63 
     64 @end
     65 
     66 @class TreeFilter;
     67 @class fptr;
     68 
     69 @interface TreeVisitorActionFiltered : TreeVisitorAction
     70 {
     71     TreeFilter *aTFilter;
     72     fptr *TDRule;
     73     fptr *BURule;
     74 }
     75 
     76 @property (assign, setter=setATFilter:) TreeFilter *aTFilter;
     77 
     78 + (TreeVisitorAction *)newTreeVisitorActionFiltered:(TreeFilter *)aFilter RuleD:(fptr *)aTDRule RuleU:(fptr *)aBURule;
     79 - (id) initWithFilter:(TreeFilter *)aFilter RuleD:(fptr *)aTDRule RuleU:(fptr *)aBURule;
     80 
     81 /** Execute an action before visiting children of t.  Return t or
     82  *  a rewritten t.  It is up to the visitor to decide what to do
     83  *  with the return value.  Children of returned value will be
     84  *  visited if using TreeVisitor.visit().
     85  */
     86 - (id<BaseTree>)pre:(id<BaseTree>) t;
     87 
     88 /** Execute an action after visiting children of t.  Return t or
     89  *  a rewritten t.  It is up to the visitor to decide what to do
     90  *  with the return value.
     91  */
     92 - (id<BaseTree>)post:(id<BaseTree>) t;
     93 
     94 @end
     95